CN107971224B - Flow field construction method and classification device for particle classification - Google Patents
Flow field construction method and classification device for particle classification Download PDFInfo
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- CN107971224B CN107971224B CN201610937874.9A CN201610937874A CN107971224B CN 107971224 B CN107971224 B CN 107971224B CN 201610937874 A CN201610937874 A CN 201610937874A CN 107971224 B CN107971224 B CN 107971224B
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- 239000002245 particle Substances 0.000 title claims abstract description 105
- 238000010276 construction Methods 0.000 title claims abstract description 17
- 239000000843 powder Substances 0.000 claims abstract description 31
- 230000009471 action Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 9
- 239000006185 dispersion Substances 0.000 claims description 10
- 230000000630 rising effect Effects 0.000 claims description 5
- 230000004323 axial length Effects 0.000 claims description 4
- 238000011144 upstream manufacturing Methods 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 abstract description 3
- 239000010419 fine particle Substances 0.000 description 8
- 238000009826 distribution Methods 0.000 description 5
- 239000011362 coarse particle Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B7/00—Selective separation of solid materials carried by, or dispersed in, gas currents
- B07B7/08—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force
- B07B7/083—Selective separation of solid materials carried by, or dispersed in, gas currents using centrifugal force generated by rotating vanes, discs, drums, or brushes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/02—Arrangement of air or material conditioning accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/06—Feeding or discharging arrangements
Abstract
The invention relates to the technical field of powder preparation and processing, and discloses a flow field construction method and a grading device for particle grading. The method comprises forming a uniform rotating airflow and a turbulent airflow below the rotating airflow in a particle classifying cavity respectively, so that particles entering the particle classifying cavity are classified under the action of the rotating airflow first, and then enter the rotating classifying airflow again under the action of the turbulent airflow to be classified. The flow field construction method for classifying the particles can more fully classify the particles, so that a classifying device applying the method has higher classifying precision.
Description
Technical Field
The invention relates to the technical field of powder preparation and processing, in particular to a flow field construction method and a grading device for particle grading.
Background
The air classification technology is widely applied to the preparation and processing links of particles such as chemical industry, minerals, metallurgy, abrasive materials, ceramics and the like. Centrifugal airflow classification principles are widely adopted for their higher classification efficiency, especially with third generation turbine classifiers. The turbine classifier mainly comprises a vertical classifier and a horizontal classifier, wherein the wheel shaft of the classifying wheel of the vertical classifier is vertically arranged relative to the horizontal plane, the wheel shaft of the classifying wheel of the horizontal classifier is horizontally arranged relative to the horizontal plane, and a plurality of technical links need to be comprehensively considered in the design process of the turbine classifier, wherein the three main links are as follows: particle dispersibility, distribution of a graded airflow field, and "lift-off" of entrained fines in the coarse powder. Good dispersibility can reduce the possibility of particle agglomeration and entrainment; the uniform and stable centrifugal force field can accurately grade the particles at a certain particle size; the fine powder entrained in the coarse powder is subjected to 'lifting analysis' by introducing secondary air flow, so that the fine powder can be returned to the classification area for secondary classification, and the classification precision is improved.
However, the prior horizontal classifier has the problems of disordered classification air flow field and unreasonable air flow distribution, thereby causing low classification precision, low separation efficiency and the like. For example, as shown in fig. 8, in the ATP-type air classifier of Alpine company, air generates an air flow field rotating in a vertical direction through tangential air inlets 21 'and 323', while the horizontal classifying wheel 1 'rotates under the drive of the rotating shaft 9' to induce the surrounding air flow to form an air flow field rotating in a horizontal direction, the two different-rotation-direction air flows interfere with each other inside the classifier and cause classification flow field disorder, so that the classification precision of the horizontal classifier is not high.
In view of the problems of the prior art, it is desirable to provide a flow field construction method and a classification apparatus for classifying particles, which are capable of classifying particles more sufficiently, so that the classification apparatus has higher classification accuracy to make up for the defects of the prior art.
Disclosure of Invention
The invention aims to provide a flow field construction method for classifying particles and a classifying device constructed based on the method, wherein the flow field construction method can more fully classify the particles, so that the classifying device has higher classifying precision.
In order to achieve the above object, the present invention proposes a flow field construction method for particle classification, the method comprising:
a uniform rotating airflow and a zigzag rising disturbance airflow which is positioned below the rotating airflow are respectively formed in the particle classifying cavity, so that particles entering the particle classifying cavity are classified under the action of the rotating airflow first, and then enter the rotating airflow again to be classified under the action of the disturbance airflow.
Preferably, the method further comprises forming a dispersion gas stream for impinging particles within the particle classification chamber in close proximity to the rotating gas stream such that the particles are previously dispersed by the dispersion gas stream before entering the rotating gas stream, wherein the dispersion gas stream comprises at least two streams of differing flow rates.
Based on the flow field construction method for particle classification, the invention also provides a classification device. The classifying device comprises: the classifying wheel is positioned in the shell, the shell comprises a first shell and a second shell which are communicated with each other, the classifying wheel is positioned in the first shell, the second shell forms a frustum shape with the inner diameter gradually reduced, the large opening end of the frustum-shaped second shell is connected with the first shell, the first shell comprises an arc-shaped plate which is connected with the large opening end in a closing way, and guide plates which extend out from the connecting positions of the arc-shaped plate and the large opening end respectively.
Preferably, the guide plate is arc-shaped with a concave surface facing the inside of the first shell and is concentric with the arc-shaped plate.
Preferably, the small opening end of the frustum-shaped second shell is provided with a coarse powder discharge opening, and the side wall of the second shell close to the small opening end is provided with a second air inlet channel.
Preferably, a turbulence assembly for scattering particles is arranged in the second shell.
Preferably, the spoiler assembly comprises a first spoiler arranged adjacent to a position between the two guide plates, and a second spoiler arranged on an inner wall of the second housing in a circumferential direction and downstream of the first spoiler, wherein the first spoiler comprises a first guide surface respectively opposite to the guide plates, and the second spoiler comprises a second guide surface which cooperates with the first guide surface so that particles can be broken up at least after passing the first guide surface and/or the second guide surface during rising or falling.
Preferably, the spoiler assemblies are arranged in a plurality of groups along the length direction of the second shell, and the cross section shape of each spoiler assembly is triangle and/or arc and/or polygon.
Preferably, the side wall of the first shell is also symmetrically provided with a fine powder discharging device which is coaxially arranged with the classifying wheel.
Preferably, the ratio of the axial length of the classifying wheel to the diameter of the classifying wheel is 0.5 to 4.
Preferably, the classifying device further comprises a feeding device, the feeding device comprises a feeding hole and an air inlet unit, the air inlet unit comprises a first air inlet pipeline and a flow dividing member located in the first air inlet pipeline, the feeding hole communicated with the first air inlet pipeline is formed in the first air inlet pipeline, the flow dividing member is arranged at the position of a through hole where the first air inlet pipeline is communicated with the feeding hole, and the flow dividing member divides the air entering through the first air inlet pipeline into at least two flows with different flow rates, so that particles entering through the feeding hole flow out under the combined action of the at least two flows of the air with different flow rates.
Preferably, the flow dividing member has a first air inlet surface and a second air inlet surface which are opposite to the inner wall of the first air inlet duct, respectively, wherein the first air inlet surface intersects with the second air inlet surface, and the distance between the first air inlet surface and the second air inlet surface and the adjacent inner wall of the first air inlet duct is gradually reduced along the air inlet direction, respectively.
Preferably, the first air inlet surface extends upstream of the through opening and the second air inlet surface extends completely through the first air inlet duct.
Preferably, the flow dividing member further comprises a receiving surface connecting the first air inlet surface and the second air inlet surface, and the receiving surface is at least partially opposite to the through hole.
Preferably, the diverting member is one or more disposed along the length direction of the first air intake duct.
Compared with the prior art, the grading device manufactured by the flow field construction method has the following advantages:
1) The particles are fully dispersed and classified for the first time in the feeding device, so that the classifying burden of a classifying wheel is reduced, and the working efficiency is greatly improved;
2) Due to the structural constraint of the first shell, the tangentially-entered airflow forms a uniform rotary classification flow field in the first shell, and the classification flow field is further strengthened by the horizontally-rotated classification wheel, which is different from the existing classification device in the construction mechanism of the classification flow field;
3) Two fine powder discharging devices are symmetrically arranged on the side wall of the first shell, so that flow field deviation and gas velocity gradient caused by single-side exhaust in a classification area of the existing classification device are eliminated, and axial air flow distribution of the classification wheel is more uniform and reasonable;
4) The turbulence assembly is arranged in the second shell, and agglomerated fine particles and fine particles adhered to coarse particles are scattered by increasing air flow turbulence, so that the 'lift-out' effect of air flow on the particles is enhanced, the entrainment of fine powder in coarse powder is reduced, and the classification precision is further improved.
Additional features and advantages of the invention will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate the invention and together with the description serve to explain, without limitation, the invention. In the drawings:
fig. 1 is a front view of the structure of a classifying apparatus according to the present invention;
FIG. 2 is a right side view of the structure of the classifying apparatus according to the present invention;
FIG. 3 is a schematic view of the fines discharger shown in FIG. 2;
FIG. 4 is a schematic view of the structure of a feeding device according to the present invention;
FIG. 5 is a front view of the structure of the first embodiment of the diverting member shown in FIG. 4;
FIG. 6 is a top view of the structure of the first embodiment of the shunt member shown in FIG. 4;
FIG. 7 is a schematic illustration of the structure of a second embodiment of a shunt member;
fig. 8 is a schematic structural view of a horizontal type classifying device in the prior art.
Description of the reference numerals
1. First air inlet pipeline of classifying wheel 21
22. Diverting member 23 feed inlet
221. First air inlet surface 222 and second air inlet surface
223. First shell of receiving surface 31
32. Arc plate of second shell 311
312. Coarse powder discharge port of deflector 322
323. Second air inlet channel 321 first spoiler
324. Second spoiler 4 fine powder discharger
5. First guide surface 6 second guide surface
7. Belt pulley 8 bearing
9. Rotating shaft
Detailed Description
The following describes specific embodiments of the present invention in detail with reference to the drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the invention, are not intended to limit the invention.
The invention provides a flow field construction method for particle classification, which comprises the steps of respectively forming uniform rotating airflow and zigzag rising disturbance airflow below the rotating airflow in a particle classification cavity, so that particles entering the particle classification cavity are classified under the action of the rotating airflow first, and then enter the rotating airflow again under the action of the disturbance airflow to be classified.
Preferably, the method further comprises forming a dispersing gas stream for impinging the particles in the particle classifying chamber in the vicinity of the rotating gas stream such that the particles are previously dispersed by the dispersing gas stream before entering the rotating gas stream.
According to the flow field construction method for particle classification, the particles can be sufficiently classified under the combined action of uniform rotating airflow and tortuous and ascending disturbance airflow which are respectively formed in the particle classification chamber and are positioned below the rotating airflow. Specifically, when the particles pass through a uniform rotating air flow, the particles are firstly classified at the position due to the difference of centrifugal forces to which the particles with different particle diameters are subjected, wherein fine particles meeting the requirements are separated and collected by a subsequent collecting device; the rest particles (including fine particles meeting the requirements and coarse particles with larger particle size) enter the turbulent airflow below the rotating airflow under the action of gravity, the fine particles clustered together and the fine particles adhered to the coarse particles meeting the requirements are further scattered under the action of the turbulent airflow, and the scattered fine particles enter the rotating airflow above again along with the ascending turbulent airflow for classification. It is noted that the turbulent airflow is meandering with respect to the rotating airflow, which lengthens the turbulent path of the particles, i.e. the "lift-out" time for fine particles meeting the requirements, and thus allows a more adequate classification of the particles. According to the invention, the method further comprises forming a dispersion gas flow for impinging the particles in the particle classifying chamber in the vicinity of the rotating gas flow such that the particles are previously dispersed by the dispersion gas flow before entering the rotating gas flow, wherein the dispersion gas flow comprises at least two streams of different flow rates.
For example, the dispersing gas flow comprises two streams of different flow rates, the first stream being formed as a jet for impact dispersion of the particles and the other stream being formed as a gas flow for lifting the first stream, which is preferably tangential to the uniform rotating gas flow formed, to achieve a better classifying effect on the particles. Of course, the dispersing airflow can also comprise a plurality of airflow with different flow rates, and the speeds of the plurality of airflow are gradually increased from top to bottom in combination with the illustration of fig. 7, so as to facilitate the powder to be more fully dispersed and simultaneously perform a plurality of presorting.
Based on the flow field construction method for particle classification, the invention provides a classification device. Fig. 1 shows a schematic structure of a classifying apparatus according to the present invention. The solid arrows in the figure are the direction of movement of the air stream a and the dashed arrows are the direction of movement of the particles B. The classifying device comprises: the classifying wheel 1 is located in the shell, the shell comprises a first shell 31 and a second shell 32 which are communicated with each other, the classifying wheel 1 is located in the first shell 31, the second shell 32 forms a frustum shape with the inner diameter gradually reduced, the large opening end of the frustum-shaped second shell 32 is connected with the first shell 31, the first shell 31 comprises an arc plate 311 which is in closed connection with the large opening end, and guide plates 312 which are respectively extended out from the connection parts of the arc plate 311 and the large opening end.
According to the invention, through the arrangement, a more uniform rotary separation flow field is formed in the cavity of the first shell 31 formed by the arc plate 311 and the guide plate 312, when particles B enter the first shell 31, particles with smaller weight enter the first shell 31 better under the cooperation of the arc plate 311 and the guide plate 312, the particles with larger weight slide into the second shell 32 along the guide plate 312 under the action of self gravity, and the strength of the classification flow field in the shell can be controlled by setting the rotation speed of the classification wheel 1, so that the particles can be classified more accurately.
In the embodiment shown in fig. 1, the deflector 312 is preferably curved with a concave surface facing the inside of the first housing 31 and concentric with the curved plate 311. The arc matches the curvature of the arcuate plate 311 for improving the uniformity of the rotating separation flow field formed within the chamber of the first housing 32 for better classifying the particles B. It is also preferable that the arc plate 311 is provided coaxially with the classifying wheel 1, and the cross-sectional shapes of both form concentric circles as shown in fig. 1.
In a preferred embodiment, the baffle 312 has an extension greater than the extension of the baffle 321. This arrangement increases the lifting action of the deflector 312 on the particles, and allows for more adequate classification of the particles while improving the uniformity of the flow field within the first housing 1.
As shown in fig. 1, the small opening end of the second housing 32 in a frustum shape is provided with a coarse powder discharge opening 322, and a second air inlet channel 323 is provided on the side wall of the second housing 32 near the small opening end. The second air inlet passage 323 serves to further classify the particles B entering the second housing 32. The air C entering through the second air inlet channel 323 blows off the particles falling into the second housing 32 again, wherein the particles with smaller weight enter the first housing 31 and continue to be classified through the classifying wheel 1, and the particles with larger weight flow out through the coarse powder outlet 322. This arrangement allows for further classification of the particles by the wind C entering through the second inlet air channel 323, thereby further providing the classification accuracy of the classification device.
In the embodiment shown in fig. 1, according to the present invention, a turbulence assembly for scattering particles is provided in the second housing 32. The spoiler assembly preferably comprises a first spoiler 321 arranged at a position adjacent between two guide plates 312, and a second spoiler 324 arranged circumferentially on the inner wall of the second housing 32 downstream of the first spoiler 321, wherein the first spoiler 321 comprises a first guide surface 5 opposite the guide plates 312, respectively, and the second spoiler 324 comprises a second guide surface 6, which second guide surface 6 cooperates with the first guide surface 5 such that particles can be broken up at least after passing the first guide surface and/or the second guide surface during ascent or descent. By providing a turbulence assembly, the fine powder entrained with the coarse powder entering the second housing 32 is redispersed and classified again as the air flow enters the first housing 31, and the coarse powder then continues to fall into the coarse powder discharge port 322, thus further providing classification accuracy of the classification device.
Further preferably, the turbulence generating means may be arranged in groups along the length of the second housing, which are arranged to break up the rising particles sufficiently to achieve a more accurate classification.
It is also preferred that both the spoiler assembly and the shunt member 22 are secured to the respective inner walls by welding. And the spoiler assembly and the diverter member 22 may each have a triangular and/or arcuate and/or polygonal cross-sectional shape, while ensuring their own function.
According to the invention, as shown in fig. 2, the side wall of the first housing 31 is also provided with a fines discharger 4 coaxially with the classifying wheel 1. Referring to fig. 5 and 6, the fine powder discharger 4 is connected to the classifying wheel 1 via a bearing 8 and a shaft 9, and one end of the shaft 9 is connected to a pulley 7. The side wall of the fine powder discharger 4 is provided with an air outlet 41 and a through hole 61 for passing through the rotating shaft 9. The symmetrical arrangement of the fine powder discharger 4 can eliminate the flow field deviation and the gas velocity gradient of the classification device caused by the single-side exhaust in the first shell 31, so that the axial airflow distribution of the classification wheel 1 is more reasonable, thereby being beneficial to improving the classification precision.
In addition, in order to increase the throughput of the classifying device to the powder, it is possible to achieve by lengthening the axial length of the classifying wheel 1, and preferably, the ratio of the axial length of the classifying wheel 1 to the diameter of the classifying wheel 1 is 0.5 to 4.
According to the present invention, as shown in fig. 1 and 4, the classifying device further comprises a feeding device, the feeding device comprises a feeding hole 23 and an air inlet unit, the air inlet unit comprises a first air inlet pipeline 21 and a diversion member 22 positioned in the first air inlet pipeline 21, the feeding hole 23 communicated with the first air inlet pipeline 21 is arranged on the first air inlet pipeline 21, the diversion member 22 is arranged at a position where the first air inlet pipeline 21 is communicated with the feeding hole 23, and the diversion member 22 divides the air entering from the first air inlet pipeline 21 into at least two air flows with different flow rates, so that particles entering from the feeding hole 23 flow out under the combined action of at least two air flows with different flow rates.
As shown in fig. 1 and 4, according to the present invention, by providing the diverting member 22 at the port where the first air intake duct 21 communicates with the feed port 23, and the diverting member 22 can divide the air a entering from the first air intake duct 21 into at least two streams a1 and a2 having different flow rates, when the particles B enter from the feed port 23, the particles B are dispersed and separated under the combined action of the air a1 and a2, for example, when the flow rate of the air a1 is greater than the flow rate of the air a2, the air a1 can perform a certain lifting action on the particles B, at this time the air a2 can more fully disperse the particles B, the particles having smaller weight in the particles B can drift with the air, and the particles having larger weight in the particles B can fall with their own gravity, so that the particles in the particles B can be further classified in the feed device. It should be noted that, the splitting member 22 in the present invention may also split the wind a entering from the first air intake duct 21 into multiple strands with different flow rates, and the specific structural arrangement thereof may be specifically selected according to actual needs, such as the type of particles, the working conditions, and the like.
In the embodiment shown in fig. 7, the above-mentioned flow guiding members 22 may be provided in plurality so as to form a plurality of air streams having different speeds in the first air intake duct 21. Preferably, the speed of the multiple air flows gradually increases from top to bottom, so as to facilitate classification by the classifying wheel 1 where the powder is more fully dispersed and more enters the first chamber.
As shown in connection with fig. 1, 5 and 6, in a preferred embodiment, the diverting member 22 has a first air intake surface 221 and a second air intake surface 222 respectively opposite to the inner wall of the first air intake duct 21, wherein the first air intake surface 221 intersects with the second air intake surface 222, and the distance between the first air intake surface 221 and the second air intake surface 222 respectively in the air intake direction and the adjacent inner wall of the first air intake duct 21 gradually decreases. The flow velocity of the air a1 and a2 is controlled by setting the distance between the first air inlet surface 221 and the second air inlet surface 222 along the air inlet direction and the inner wall of the adjacent first air inlet duct 21, respectively. Preferably, in the same cross section of the first air inlet duct 21, the distance between the first air inlet surface 221 and the adjacent inner wall of the first air inlet duct 21 is larger than the distance between the second air inlet surface 222 and the adjacent inner wall of the first air inlet duct 21, which is arranged to make the flow velocity of the wind a1 larger than the flow velocity of the wind a2, thereby achieving a better classifying effect on the particles B. It is further preferred that the distance between the first air inlet surface 221 and the inner wall of the adjacent first air inlet duct 21 is 2 to 3 times the distance between the second air inlet surface 222 and the inner wall of the adjacent first air inlet duct 21.
It is also preferred that the first air inlet surface 221 extends upstream of the through opening and the second air inlet surface 222 extends completely through the first air inlet duct 21. In this arrangement, the second air inlet surface 222 isolates the air a1 from the particles B entering from the inlet 23 at the opening, and prevents the particles B from being blown out from the opening by the air a 1.
In another preferred embodiment, the diverting member 22 further includes a receiving surface 223 connecting the first air inlet surface 221 and the second air inlet surface 222, the receiving surface 233 being at least partially opposite the through opening. The receiving surface 223 serves on the one hand to receive the particles B entering from the inlet opening 23 and to provide a guiding surface for the entry of the particles B, and on the other hand, when the particles B fall onto the receiving surface 223, the particles B are further broken up, thereby facilitating the classifying action of the wind a1 and the wind a2 on the particles B. Preferably, the receiving surface 233 is diametrically opposed to the through opening.
In the preferred embodiment shown in fig. 1, the axial direction of the first air intake duct 21 is 30 ° to 75 ° from the horizontal direction, and the axial direction of the feed port 23 is-20 ° to 20 ° from the vertical direction. This arrangement facilitates a smoother entry of wind a and particles B, thereby facilitating classification of the particles.
Compared with the prior art, the grading device provided by the invention has the following advantages:
1) The particles B are fully dispersed and classified once in the feeding device, so that the classifying burden of the classifying wheel 1 is lightened, and the working efficiency is greatly improved;
2) Due to the structural constraint of the first housing 31, the gas can form a uniform rotary classification flow field in the first housing 31 through the classification wheel 1, which is different from the prior classification device in the construction mechanism of the classification flow field;
3) Two fine powder discharging devices 4 are symmetrically arranged on the side wall of the first shell 31, so that flow field deviation and gas velocity gradient caused by single-side exhaust in a classification area of the existing classification device can be eliminated, and the axial air flow distribution of the classification wheel is more reasonable;
4) The turbulence assembly is arranged in the second shell 32, and agglomerated fine powder and fine powder adhered to coarse particles are scattered by increasing airflow turbulence, so that the 'lift-out' effect of wind C on the particles is enhanced, the entrainment amount of fine powder in the coarse powder is reduced, and the classification precision is further improved.
The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the scope of the technical concept of the present invention, and all the simple modifications belong to the protection scope of the present invention.
In addition, the specific features described in the above embodiments may be combined in any suitable manner without contradiction. The various possible combinations of the invention are not described in detail in order to avoid unnecessary repetition.
Moreover, any combination of the various embodiments of the invention can be made without departing from the spirit of the invention, which should also be considered as disclosed herein.
Claims (12)
1. A flow field construction method for particle classification, the method comprising:
forming uniform rotating airflow and zigzag rising disturbance airflow below the rotating airflow in the particle classifying cavity respectively, so that particles entering the particle classifying cavity are classified under the action of the rotating airflow first, and then enter the rotating airflow again to be classified under the action of the disturbance airflow;
the method further includes forming a dispersion gas stream within the particle classification chamber proximate the rotating gas stream for impinging particles such that particles are previously dispersed by the dispersion gas stream prior to entering the rotating gas stream, wherein the dispersion gas stream includes at least two streams of differing flow rates.
2. A grading apparatus, comprising: the classifying wheel (1) is positioned in the shell, the shell comprises a first shell (31) and a second shell (32) which are communicated with each other, the classifying wheel (1) is positioned in the first shell (31), the second shell (32) forms a frustum shape with the inner diameter gradually reduced, the large opening end of the frustum-shaped second shell (32) is connected with the first shell (31), the first shell (31) comprises an arc plate (311) which is in closed connection with the large opening end, and guide plates (312) which are respectively extended from the connection parts of the arc plate (311) and the large opening end;
the classifying device further comprises a feeding device, the feeding device comprises a feeding hole and an air inlet unit, the air inlet unit comprises a first air inlet pipeline (21) and a flow dividing member (22) positioned in the first air inlet pipeline (21), the first air inlet pipeline (21) is provided with a feeding hole (23) communicated with the first air inlet pipeline (21), the flow dividing member (22) is arranged at a position where the first air inlet pipeline (21) is communicated with the feeding hole (23), and the flow dividing member (22) divides the air entering from the first air inlet pipeline (21) into at least two strands with different flow rates, so that particles entering from the feeding hole (23) flow out under the combined action of the air with at least two different flow rates;
the flow dividing member (22) is one or more arranged along the length direction of the first air inlet pipeline (21).
3. Grading device according to claim 2, characterized in that the deflector (312) is arc-shaped with a concave surface facing the inside of the first housing (31) and concentric with the arc-shaped plate (311).
4. A classifying device according to claim 2 or 3, characterized in that the small opening end of the second housing (32) in the form of a truncated cone is provided with a coarse powder discharge opening (322), and that the side wall of the second housing (32) near the small opening end is provided with a second air inlet channel (323).
5. Grading device according to claim 4, characterized in that a turbulence assembly for breaking up particles is provided in the second housing (32).
6. The classifying device according to claim 5, wherein the spoiler assembly comprises a first spoiler (321) arranged at a position adjacent between two of the guide plates (312), and a second spoiler (324) arranged circumferentially on an inner wall of the second housing (32) downstream of the first spoiler (321), wherein the first spoiler (321) comprises a first guide surface (5) opposite the guide plates (312), respectively, and the second spoiler (324) comprises a second guide surface (6), and the second guide surface (6) cooperates with the first guide surface (5) such that the particles can be scattered at least after passing the first guide surface and/or the second guide surface during ascent or descent.
7. The grading device according to claim 6, wherein the turbulence elements are arranged in groups along the length of the second housing, and wherein the cross-sectional shape of the turbulence elements is triangular and/or arcuate and/or polygonal.
8. A classifying device according to claim 2 or 3, characterized in that the side wall of the first housing (31) is also provided with a fines discharger (4) coaxial with the classifying wheel (1) symmetrically.
9. A classifying device according to claim 2 or 3, characterized in that the ratio of the axial length of the classifying wheel (1) to the diameter of the classifying wheel (1) is 0.5 to 4.
10. The classifying device according to claim 2, wherein the diverting member (22) has a first air intake surface (221) and a second air intake surface (222) which are respectively opposed to the inner wall of the first air intake duct (21), wherein the first air intake surface (221) intersects with the second air intake surface (222), and a distance between the first air intake surface (221) and the second air intake surface (222) and the adjacent inner wall of the first air intake duct (21) is gradually reduced in an air intake direction, respectively.
11. The classifying device according to claim 10, wherein the first air inlet face (221) extends upstream of the through opening and the second air inlet face (222) extends completely through the first air inlet duct (21).
12. The classifying device according to claim 11, wherein the flow dividing member (22) further comprises a receiving surface (223) connecting the first air inlet surface (221) and the second air inlet surface (222), the receiving surface (223) being at least partially opposite the through opening.
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108745571A (en) * | 2018-06-22 | 2018-11-06 | 南京西普水泥工程集团有限公司 | A kind of material dispersing device |
| CN110496688A (en) * | 2019-08-09 | 2019-11-26 | 江苏吉能达环境能源科技有限公司 | A kind of ultrafine fraction grade machine |
| CN110773428B (en) * | 2019-10-28 | 2022-03-25 | 河北科技大学 | Powder selecting machine |
| CN111054630B (en) * | 2019-12-03 | 2021-11-05 | 河北科技大学 | Compact horizontal powder concentrator |
| CN112945823A (en) * | 2021-02-22 | 2021-06-11 | 浙江浙能嘉华发电有限公司 | Particle enrichment device and method for flow field |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2214232Y (en) * | 1994-08-24 | 1995-12-06 | 电力部南京电力环境保护科学研究所 | Powder lot size-grading machine |
| CN2262958Y (en) * | 1996-04-05 | 1997-09-24 | 沙市津江超细粉体有限公司 | Pneumatic three grade powder separator |
| CN2456852Y (en) * | 2000-10-30 | 2001-10-31 | 华电环保系统工程有限公司 | Particle sorting mahcine |
| JP2004313994A (en) * | 2003-04-18 | 2004-11-11 | Akoo:Kk | Method and apparatus for separating powder or the like from granule |
| US6910585B1 (en) * | 2000-08-31 | 2005-06-28 | Fisher-Klosterman, Inc. | Dynamic centrifugal gas classifier and method of classifying performed therewith |
| CN101342529A (en) * | 2008-08-15 | 2009-01-14 | 费建祖 | High-efficiency size grading unit equipment |
| CN101767093A (en) * | 2010-03-15 | 2010-07-07 | 天津水泥工业设计研究院有限公司 | Powder concentrator integrating functions of scattering, drying and grading into whole |
| CN202155313U (en) * | 2011-06-23 | 2012-03-07 | 中材装备集团有限公司 | Centrifugal vertical cage type dynamic powder concentrator with forced vortex |
| CN102580923A (en) * | 2012-02-22 | 2012-07-18 | 成都利君实业股份有限公司 | Multistage series integrated V-shaped powder selecting machine |
| CN204842208U (en) * | 2015-04-29 | 2015-12-09 | 中国石油大学(北京) | Wheeled air current selection powder machine crouches |
| CN206240790U (en) * | 2016-10-25 | 2017-06-13 | 中国石油化工股份有限公司 | Grading plant |
-
2016
- 2016-10-25 CN CN201610937874.9A patent/CN107971224B/en active Active
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2214232Y (en) * | 1994-08-24 | 1995-12-06 | 电力部南京电力环境保护科学研究所 | Powder lot size-grading machine |
| CN2262958Y (en) * | 1996-04-05 | 1997-09-24 | 沙市津江超细粉体有限公司 | Pneumatic three grade powder separator |
| US6910585B1 (en) * | 2000-08-31 | 2005-06-28 | Fisher-Klosterman, Inc. | Dynamic centrifugal gas classifier and method of classifying performed therewith |
| CN2456852Y (en) * | 2000-10-30 | 2001-10-31 | 华电环保系统工程有限公司 | Particle sorting mahcine |
| JP2004313994A (en) * | 2003-04-18 | 2004-11-11 | Akoo:Kk | Method and apparatus for separating powder or the like from granule |
| CN101342529A (en) * | 2008-08-15 | 2009-01-14 | 费建祖 | High-efficiency size grading unit equipment |
| CN101767093A (en) * | 2010-03-15 | 2010-07-07 | 天津水泥工业设计研究院有限公司 | Powder concentrator integrating functions of scattering, drying and grading into whole |
| CN202155313U (en) * | 2011-06-23 | 2012-03-07 | 中材装备集团有限公司 | Centrifugal vertical cage type dynamic powder concentrator with forced vortex |
| CN102580923A (en) * | 2012-02-22 | 2012-07-18 | 成都利君实业股份有限公司 | Multistage series integrated V-shaped powder selecting machine |
| CN204842208U (en) * | 2015-04-29 | 2015-12-09 | 中国石油大学(北京) | Wheeled air current selection powder machine crouches |
| CN206240790U (en) * | 2016-10-25 | 2017-06-13 | 中国石油化工股份有限公司 | Grading plant |
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|---|---|
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